+++ news +++

We re-calculated our prices and are pleased to announce that while some products went up we can offer others for less and some for the same prices as several years. The product catalog and price list will be available for download shortly.

We are very happy to announce our new partnership with CSC China Standard Certification in Beijing and Qingdao. Together with our well experienced and established representation through Nanjing Langmuir Trading CO.,LTD, the new partnership and technical cooperation with CSC will allow us to contribute to the development of test materials and refinement of test concepts and standards in China.

We posted the presentations delivered at the 47th IDC Conference in Duesseldorf in our Presentations section, together with a number of older publications.

Batches / Lots

Quality Control Data

The fabric used as Energy Test Cloth is specified in the U.S. Federal Register. We have been supplying the official Energy Test Cloth since lot 18 (labelled as 'wfk lot 002'). We check the quality of the material we ship constantly and have the fabric externally analized before any samples are sent out for the official approval testing (i.e. approval and establishment of correction coefficients, see below). The list and links below give you access to our batch specific QC data and quality certificates:

Correction coefficients

The Correction Coefficients for different DOE Energy Test Cloth lots can be found on the official DOE server, or mirrored here on the WFK server (including latest updates): For your convenience we make calibration data and correction coefficients available here for you to download.